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Oliver, Cletrac, Co-op & Cockshutt Tractors Discussion Forum
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Starter switch and 12v?

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Norski

08-16-2007 18:54:11




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Hey all. Question about the starter switch. 88rc 1950 Dsl engine. Orig. had 2 6v batteries. I replaced the batteries with one 12v. I have been able to get it running and I have put the tractor to work. Then (from old post) I shorted out against the starter body. Starter still works.I am now repairing and checking wires as I go in my search for a real fuse panel.(By the way thanks for the advice on new wiring from Korves..sp?) Any way I have red lights that work on the back I also ave a light facing back on the fender but I have two KC lights mounted to shine forward and I dont seem to have enough juice to get them to light up. I have opened up my rotary starter switch (ing. Hyd+ign. lights+ign+floods etc.)and all is well in there. My question is... is that switch 6v?,is there such a thing? I run a light bulb style current tester and I get power from the batt. to the neg lead coming out of the two headlights but it is not enough to light em up. Any help would be appreciated. Thanks

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ACEd

08-17-2007 17:56:09




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 Re: Starter switch and 12v? in reply to Norski, 08-16-2007 18:54:11  
If you originally had 2 6v batteries I think they were probably wired in a series to produce 12v for the diesel starters - more power for higher compression - so probably entire system is already rated for 12v - but as said elsewhere, not much difference in 6v vs 12v DC as to components - now if you were talking amps - there may be some issues - and generally 6v battery cables were bigger than 12v cables to reduce losses

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Norski

08-17-2007 02:32:45




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 Re: Starter switch and 12v? in reply to Norski, 08-16-2007 18:54:11  
Thanks for the advice RAB & old much appreciated. I was just over browsing through "Parts and Pieces" and there is a diagram for wiring 88 dsl with starter rod. It appears that the positive pole on the battery goes to ground. Is this true? thanks



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old

08-17-2007 08:58:36




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 Re: Starter switch and 12v? in reply to Norski, 08-17-2007 02:32:45  
If it has a genny on it yes it will be + ground. Now if it has an alternator on it theres a 99% chance it will be - ground unless your useing and alternator that is made in england and they still use + ground systems or did the last time I was in england which has been a few years



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RAB

08-17-2007 13:20:58




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 Re: Starter switch and 12v? in reply to old, 08-17-2007 08:58:36  
Old, it must have been a lot of years since you were over here. I have never seen a positive earth A/C generator on any vehicle/machine in England. Good try. I might check out my early Honda motorcycles as they had alternators built into the engines and used selenium rectifiers, but nothing as a separate unit.
Regards, RAB



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old

08-17-2007 13:38:15




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 Re: Starter switch and 12v? in reply to RAB, 08-17-2007 13:20:58  
Well all the truphs and other english cars I ever owned and I have had a few where all + ground system with alternators. As I said I didn't know for sure if they still used the + ground system or not just knew they had back when I was over there in the 70s



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RAB

08-17-2007 14:16:02




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 Re: Starter switch and 12v? in reply to old, 08-17-2007 13:38:15  
I've only lived here for nigh-on 60 years and all my cars were either 12 volt positive ground with a D/C dynamo (and we used to change them over to negative ground usually, so we didn't make mistakes jumping different cars for starting) or negative ground with an A/C generator. Nearly all D/C generators (dynamo) were positive earth up to early 60s, then as A/C generators (alternator) were fitted as standard to most vehicles, the standard earth was changed to negative. None, or very few, positive ground alternators. Like I say, I have never come across one yet and I used to change from dynamo to alternator (as soon as I could locate a cheap alternator - usually a derated Lucas ACR14 from a tractor) on all the Ford cars I owned (from late 50s vintage to middle 60s) during the late 60s after I passed my driving test. BTW I also used to change the coil spring clutch to a diapragm type PDQ as we used to run them a bit hard in those days. The first car I actually bought which had an alternator was a 1970 Ford Escort. Sorry, but you are mistaken about negative earth A/C generators in UK vehicles in the UK!
Regards, RAB

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old

08-17-2007 14:43:17




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 Re: Starter switch and 12v? in reply to RAB, 08-17-2007 14:16:02  
Well like I said I just know what I have ran across and of course most where here in the U.S. so who know what they might have done as far as importing them. I do know I had a friend that had a mid 70s MG and it was + ground with an alternator but again may have been set up that way for impost to the U.S and not done that way over the pond



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RAB

08-17-2007 00:41:08




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 Re: Starter switch and 12v? in reply to Norski, 08-16-2007 18:54:11  
A switch will have basically 2 ratings A/C and D/C. For each of these there will be max voltage (and in the 6 - 12 volts range it is not important as it is for the insulation qualities of the switch) and then the max current. As power equals current squared times the resistance (I2*R) you will be able to use four times the power on 12 volts as on the same switch using 6 volts.
Hope that helps.
Regards, RAB

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old

08-16-2007 20:00:48




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 Re: Starter switch and 12v? in reply to Norski, 08-16-2007 18:54:11  
A switch doesn't care if its 6 volts or 12 volts but it does care about how many amps your pulling through it. So your problem maybe that using the newer type lights your pulling to many amps and it will burn out because of it or you aren't using big enough wire to handle the amps



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